February in Ust'-Yansk is the most freezing month of the year. In February, the weather in Ust'-Yansk is typically freezing. Average daily high temperature in February is about 29 degrees below zero. On average, Ust'-Yansk has 16 partly cloudy, 9 sunny, and 4 cloudy days in February. February as well as January, March, April, and October is considered the most uncomfortable time to visit Ust'-Yansk.